SystemVerilog is an extension of Verilog, recent hardware design and verification tools are usually configured for SV support even if you are compiling standard Verilog designs. You'll start learning with basic Verilog constructs and proceed to SV specific elements if they help to improve your code.
In 2009, the Verilog standard (IEEE 1364-2005) was merged into the SystemVerilog standard, creating IEEE Standard 1800-2009. Since then, Verilog has been officially part of the SystemVerilog language. The current version is IEEE standard 1800-2023